著者

齊藤 亜由子 宮脇 和人 小松 瞭 巖見 武裕

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.865, pp.18-00263, 2018 (Released:2018-09-25)

参考文献数

20

被引用文献数

1

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This paper describes the use of nine-axis motion sensors to evaluate the motion sensor position on the thigh and lower leg during walking. The motion sensors are mounted on a subject's body using adhesive tape. The muscles constantly relax or contract because of human movement. Therefore, joint angle estimation using motion sensors produces different accuracy depending on the position where the motion sensor is mounted. Evaluating the motion sensor position is important for improving the joint angle estimation accuracy. For this study, the authors used six nine-axis motion sensors and a 3D motion analysis system to assess walking exercise. Three motion sensors were mounted to the thigh; three were mounted to the lower leg. The knee joint angle was estimated using a sensor fusion algorithm that corrected the centrifugal acceleration and the tangential acceleration in the acceleration sensor output. We evaluated the accuracy of knee joint angle estimation by comparing the nine-axis motion sensor results and the 3D motion analysis system results. Results demonstrated the possibility of high-accuracy estimation when the motion sensor is attached to a position 50% or 75% from the upper end of the thigh and another sensor is attached to a position 25% or 50% from the upper end of the lower leg.

著者

宮脇 和人

出版者

多文化関係学会

雑誌

多文化関係学 (ISSN:13495178)

巻号頁・発行日

vol.6, pp.21-36, 2009 (Released:2017-03-28)

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本研究の目的は非捕鯨地である豊後水道海域と捕鯨地である和歌山県太地町の鯨祭祀を比較することによって、祭祀にかかわった人びとの鯨観を明らかにすることにある。伝統的捕鯨地である太地町の鯨祭祀をみると、鯨は人間と等価に供養されているが、資源とみなされているため供養は一括して行われる。また太地町の供養の歴史と現状をみると、鯨祭祀の基本パターンが導き出せる。鯨祭祀の基本パターンは、鯨が来訪した際には反対給付として供養を施すありかたを核とし、鯨をもたらした要因や鯨がもたらすものに配慮し供養する動機がみられる。また、非捕鯨地の豊後水道海域の鯨祭祀の動機も、この基本パターンのうちにある。これらの動機の表現型として鯨祭祀をとらえると、豊後水道海域の鯨祭祀は、多様である点が特徴である。太地町では鯨が人間と等価とみなされている。豊後水道海域では、やはり人間と等価に表象されているが、ある事例では鯨に法要・戒名・位牌・過去帳を与えている例さえあり、鯨の扱いに差異が認められる。豊後水道海域においては、鯨の来訪は非日常的であり、それゆえ地域社会にとって鯨は個的な体験として捉えられている。つまり、当該海域では、鯨に特有の性格が付与され異なった祭祀を施されていると考えられる。

著者

齊藤 亜由子 宮脇 和人 木澤 悟

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.852, pp.17-00234-17-00234, 2017 (Released:2017-08-25)

参考文献数

16

被引用文献数

2

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This paper presents a proposed method for center of gravity (COG) velocity estimation during squatting using information obtained from lower limb motion measurements. A squat exercise uses the lower limb joints and the muscles around these joints. The squat exercise velocity changes according to the lower limb muscle activity. Some earlier reports of relevant studies have suggested that muscle weakness and neurological deterioration influence the COG velocity when standing up. Therefore, it is important to clarify the relation between the COG velocity and lower limb motion for efficient training and the prevention of falls among older people. For this study, we constructed a squat velocity model that represents the relation between the COG velocity and lower limb joint power during squatting. Although no joint power indicates each muscle activity in detail, it is possible to estimate muscle activities around the joints approximately by using the joint power. For this experiment, the squat exercise was measured using a 3D motion analysis system. The experiment was conducted for three stance widths. The COG velocity and the lower limb joint powers were calculated using information from the 3D motion analysis system. We estimated the squat velocity model parameters by application of Kalman filter using the measurement information. The analysis results for the squat velocity model indicated a quantitative relation between the COG velocity and the lower limb joint power during squatting. Furthermore, comparable results were obtained from three stance widths. This analytical method is anticipated for use in evaluation of motor function and exercise assisting device design.